Question

当我尝试通过C＃代码为Outlook附加我的日历事件中的文件时，我收到此错误并且邮件被触发但没有附件。

我的代码为贝娄

private static MailMessage MailMessageComp(DateTime dtStartDateTime, DateTime dtEndDateTime, string sSubject,
        string sSummary, string sLocation, string sOrganizerName, string sOrganizerEmail, MailAddressCollection attendeeList, DataMailItem _mailItem, bool bStatus) {
        MailMessage msg = new MailMessage();

        System.Net.Mime.ContentType textType = new System.Net.Mime.ContentType("text/plain");
        System.Net.Mime.ContentType HTMLType = new System.Net.Mime.ContentType("text/html");
        System.Net.Mime.ContentType calendarType = new System.Net.Mime.ContentType("text/calendar");

        calendarType.Parameters.Add("method", ((bStatus) ? "CANCEL" : "REQUEST")); // "REQUEST");
        calendarType.Parameters.Add("name", "meeting.ics");

        AlternateView textView = AlternateView.CreateAlternateViewFromString(_mailItem.Body, textType);
        msg.AlternateViews.Add(textView);

        AlternateView HTMLView = AlternateView.CreateAlternateViewFromString(_mailItem.Body, HTMLType);
        string attachmentName = "myPdf.pdf";
        msg.AlternateViews.Add(HTMLView);
        //create the Body in VCALENDAR format
        string calDateFormat = "yyyyMMddTHHmmssZ";
        string bodyCalendar = "BEGIN:VCALENDAR\r\n" + "METHOD:" + ((bStatus) ? "CANCEL" : "REQUEST") + "\r\n" + "PRODID:Microsoft CDO for Microsoft Exchange\r\n" + "VERSION:2.0\r\n" 
            + "BEGIN:VTIMEZONE\r\n" + "TZID:(GMT-06.00) Central Time (US & Canada)\r\n" + "X-MICROSOFT-CDO-TZID:11\r\n" + "BEGIN:STANDARD\r\n" + "DTSTART:16010101T020000\r\n"
            + "TZOFFSETFROM:-0500\r\n" + "TZOFFSETTO:-0600\r\n" + "RRULE:FREQ=YEARLY;WKST=MO;INTERVAL=1;BYMONTH=11;BYDAY=1SU\r\n" + "END:STANDARD\r\n" + "BEGIN:DAYLIGHT\r\n" 
            + "DTSTART:16010101T020000\r\n" + "TZOFFSETFROM:-0600\r\n" + "TZOFFSETTO:-0500\r\n" + "RRULE:FREQ=YEARLY;WKST=MO;INTERVAL=1;BYMONTH=3;BYDAY=2SU\r\n" 
            + "END:DAYLIGHT\r\n" + "END:VTIMEZONE\r\n" + "BEGIN:VEVENT\r\nDTSTAMP:{8}\r\n"
            + "ATTACH;ENCODING=BASE64;VALUE=BINARY;X-FILENAME=" + "TestFile.pdf" + ":{10}\r\n"
            + "DTSTART:{0}\r\n" + "SUMMARY:{7}\r\nUID:{5}\r\n" +
            "{9}\":MAILTO:{9}\r\nACTION;RSVP=TRUE;CN=\"{4}\":MAILTO:{4}\r\nORGANIZER;CN=\"{3}\":mailto:{4}\r\nLOCATION:{2}\r\nDTEND:{1}\r\nDESCRIPTION:{7}\\N\r\nSEQUENCE:1\r\nPRIORITY:5\r\nCLASS:\r\nCREATED:{8}\r\nLAST-MODIFIED:{8}\r\nSTATUS:CONFIRMED\r\nTRANSP:OPAQUE\r\nX-MICROSOFT-CDO-BUSYSTATUS:BUSY\r\nX-MICROSOFT-CDO-INSTTYPE:0\r\nX-MICROSOFT-CDO-INTENDEDSTATUS:BUSY\r\nX-MICROSOFT-CDO-ALLDAYEVENT:FALSE\r\nX-MICROSOFT-CDO-IMPORTANCE:1\r\nX-MICROSOFT-CDO-OWNERAPPTID:-1\r\nX-MICROSOFT-CDO-ATTENDEE-CRITICAL-CHANGE:{8}\r\nX-MICROSOFT-CDO-OWNER-CRITICAL-CHANGE:{8}\r\nBEGIN:VALARM\r\nACTION:DISPLAY\r\nDESCRIPTION:REMINDER\r\nTRIGGER;RELATED=START:-PT00H15M00S\r\nEND:VALARM\r\nEND:VEVENT\r\nEND:VCALENDAR\r\n";

        bodyCalendar = string.Format(bodyCalendar,
            dtStartDateTime.ToUniversalTime().ToString(calDateFormat),
            dtEndDateTime.ToUniversalTime().ToString(calDateFormat),
            sLocation,
            sOrganizerName,
            sOrganizerEmail,
            Guid.NewGuid().ToString("B"),
            sSummary,
            ((bStatus) ? "Cancelled " : "")+ sSubject,
            DateTime.Now.ToUniversalTime().ToString(calDateFormat), BuildAttendees(attendeeList, ((bStatus) ? "CANCEL" : "NEEDS-ACTION"))
            , GetRDocPDFAttachment(_mailItem.ProjectRefNo.ToString(), _mailItem.ResponseId.ToString()));
        //attendeeList.ToString());
        AlternateView calendarView = AlternateView.CreateAlternateViewFromString(bodyCalendar, calendarType);
        //calendarView.TransferEncoding = TransferEncoding.Base64;
        msg.AlternateViews.Add(calendarView);

        //  Adress the message
        msg.From = new MailAddress(sOrganizerEmail, sOrganizerName);
        foreach(MailAddress attendee in attendeeList) {
            msg.To.Add(attendee);
        }
        msg.Bcc.Add(new MailAddress(_mailItem.From.EmailAddress, _mailItem.From.Name));
        msg.Subject = sSubject + ((bStatus) ? " - Cancelled" : "");
        return msg;
    }

这个MailMessage正在编写，然后我发送邮件。

除了日历活动的附件外，一切都很好。

请帮忙。

提前感谢你。 Umakanta（巴布）。

Answer 1

在此代码中，您实际上并未附加文件，而是创建包含文本，HTML和日历备用视图的消息。但是，您无处将文件附加到MailMessage。

您声明了一个包含附件名称的字符串：

string attachmentName = "myPdf.pdf";

但是，此attachmentName永远不会再次引用。如果您要将此内容添加到邮件中，则必须执行以下操作：

msg.Attachments.Add(...)

您可以查看How do I add an attachment to an email using System.Net.Mail?，了解有关如何实际添加附件的更多详细信息。

我希望我能正确理解这个问题，希望这会有所帮助。

ReadTimeout和writeTimeout以编程方式将文件附加到日历事件时抛出异常

1 个答案: